| abstract |
Disclosed are dye formulations containing A) 5 to 25 percent by weight of at least one unsulfonated azo metal complex dye, B) 75 to 95 percent by weight of an organic solvent, C) 1 to 40 percent by weight of polyvinylpyrrolidon, and D) 1 to 40 percent by weight of a non-ionic surfactant, the percentages by weight being in relation to 100 percent by weight of the mixture of components A and B. Also disclosed are the production of the inventive dye formulations, the use thereof for dying leather, and correspondingly dyed leather. |